Logging Mixed signals to TDMS

[sherzaad]

Maybe not the best way to do this but I currently have the following setup to plot 8 digial signals and 8 Analog signals to a mixed signal graph:

I now would like to save those signals to the a TDMS file 

From examples I've looked at, it I seems that I could use the 'configure logging.vi' block

Can I use this block in the same way with my setup?

Where I am unclear is, if yes, how to wire these blocks so that the digital and analog signals are written to the same TDMS file correctly.

Alternatively I could always export the plot to excel but I feel that its not the best way to store the data....

any advice on improving my current setup is also welcomed! 😉

[sherzaad]

found my solution here! 🙂

TDMS Data Logging From Multiple DAQmx Tasks in LabVIEW 

[sherzaad]

---

@sherzaad wrote:

found my solution here! 🙂

TDMS Data Logging From Multiple DAQmx Tasks in LabVIEW 

---

I till have a problem.... 😒

the TDMS write Function block is not accepting the digital waveform input!

from the help for that block its seem that:

"If the data input contains  compressed digital data, you must enter the name of the compression channel as the first entry in the channel name(s) in array."

"channel name(s) in" accepts a string but what should I write in it is not clear to me! 😞

How to setup the block to accept digital waveform input?

Any help would be much appreciated...

[sherzaad]

the TDMS write Function block is not accepting the digital waveform input! ....

Ok.... from what I have been able to understand is that this block does not accept a 1D digital array waveform.

So... the next question is:

How to save the digital waveforms to TDMS?

Anyone any ideas????

Really need a solution to this problem....

[Marco_Ge]

TDMS is a very flexible way for storing data.Some ideas:

1) Convert each digital channel to an analog waveform, make an array and save it to  TDMS (this creates a very redundant data file, a good and fast approach only if your sampling rate is low and your recording time is not too high);

2) Save your binary port data as U8/U16 and store only port status variations with relative event timestamps (like xy couples, where X is timestamp, Y is port status). This is a more compact way to store, but not as a waveform data type.